text: import React from 'react';
  import ReactDOM from 'react-dom';
  import './index.css';
  import App from './App';
  import registerServiceWorker from './registerServiceWorker';
  import * as firebase from 'firebase';
  // Initialize Firebase
  const config = {
    apiKey: 'AIzaSyCI1co6DKDmFkm-b3lJUmfHfNJmZJ1IWkY',
    authDomain: 'slack-demo-2ad89.firebaseapp.com',
    databaseURL: 'https://slack-demo-2ad89.firebaseio.com',
    projectId: 'slack-demo-2ad89',
    storageBucket: 'slack-demo-2ad89.appspot.com',
    messagingSenderId: '947277133194',
  };
  firebase.initializeApp(config);
  
  ReactDOM.render(<App />, document.getElementById('root'));
  registerServiceWorker();
  